Re: Lost of performance over AMD-V with KVM?

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On Tue, Jul 09, 2013 at 02:20:43PM +0200, Victor fernandez wrote:
> Hi EveryBody!
> 
> recently, we have tested some specific High Energy Physics benchmarks that
> was running over S.L.6 and we observed that the performance over AMD
> machines was really bad, about 30-40% lost. We were investigating
> and we conclude that the problem was with some cpu flags. These cpu
> flags are important for running our application because it is optimazed
> for running with them. So, we tuning our KVM with the name of flags
> parameters and with "-cpu host" parameter too, but
> we observed that the flags that we needed, they weren't included when
> we started the S.L.6 instance. We try to solve it, but when we conclude
> that the specific flags weren't included in the code of the last
> versions of KVM
> and LibVirt(capabilities). Do you know something about this problem or
> you are aware of this?
> 
What flags are missing?

--
			Gleb.
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